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À propos de : Synthesis of Novel1,3,5-Tris(arylazo)benzenes viaPd-Catalyzed Couplings andCu(I)-Mediated Direct Oxidations        

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  • Synthesis of Novel1,3,5-Tris(arylazo)benzenes viaPd-Catalyzed Couplings andCu(I)-Mediated Direct Oxidations
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  • A series of novel 1,3,5-tris-azobenzenes wereprepared from 1,3,5-trihalobenzene via Pd-catalyzed couplings of N-Boc aryl hydrazines and subsequent Cu(I)-mediated direct oxidations. The oxidation of tris-arylhydrazide provided the azobenzene as a mixture of all four ofthe possible E/Z-isomers; [E,E,E]-, [E,E,Z]-, [E,Z,Z]-, and[Z,Z,Z]-1,3,5-tris-azobenzenes. A slow removal of the solventin the dark transformed the isomers into the all-trans,[E,E,E]-isomer.
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